Y Combinator Startups in Seattle that are currently hiring 2024

April 2024

Browse 9 of the top startups funded by Y Combinator. Headquartered in Seattle, these are some of the hottest and fastest-growing startups. Their teams are well-funded and actively hiring.

We also have a Startup Directory where you can search through over 5,000 companies.

  • Relativity Space
    Relativity Space (w2016)Active • 1,000 employees • Los Angeles, CA, USA
    Relativity is building humanity’s multiplanetary future. We invented a new approach to design, build, and fly our own rockets, starting with Terran 1 – the world’s first entirely 3D printed rocket, and Terran R, our next generation medium-heavy lift fully reusable launch vehicle. As a vertically integrated technology platform, Relativity is at the forefront of an inevitable shift toward software-defined manufacturing. By fusing 3D printing, artificial intelligence, and autonomous robotics, we are pioneering the factory of the future. Disrupting 60 years of aerospace, Relativity offers a radically simplified supply chain, building a rocket with 100x fewer parts in less than 60 days. We believe in a future where interplanetary life fundamentally expands the possibilities for human experience. Our long-term vision is to upgrade humanity’s industrial base on Earth and on Mars.
    machine-learning
    space-exploration
    rocketry
    3d-printing
    manufacturing
  • Mixpanel
    Mixpanel (s2009)Active • 410 employees • San Francisco, CA, USA
    Mixpanel is analytics for builders that need answers from their data at their fingertips. When everyone in the organization can see — and learn from — the impact of their work, they are poised to make better decisions. Companies like OpenAI, Netflix, Pinterest, sweetgreen, CNN, samsara, Uber, and Yelp use Mixpanel to understand their customers, measure progress, and endeavor to make better decisions.
    b2b
    analytics
    data-visualization
    cloud-computing
    databases
  • Gordian Software
    Gordian Software (w2019)Active • 20 employees • Bellevue, WA, USA
    Our APIs enable the world's leading travel organizations to delight travelers and increase revenue. Our customers are companies like Priceline, Hopper and Trip.com, and we support over 140 airlines including partnerships with Lufthansa Group, United Airlines, and Singapore Airlines. Gordian has grown rapidly and serves more than 60 million passengers per month. Launched in 2017, Gordian is backed by Y Combinator, Accomplice, Vinyl, Kinnevik, DST Global Partners, Latitude, and Naval Ravikant. For more information, visit gordiansoftware.com
    travel
  • treble.ai
    treble.ai (s2019)Active • 38 employees • São Paulo, State of São Paulo, Brazil
    We help companies build and scale marketing campaigns through WhatsApp, reaching their customers anywhere in the world with engaging conversations. With our platform, businesses can create and send conversations massively to users and get analytics to improve their campaign performance over time, increasing conversion in every stage of the funnel.
    messaging
    marketing
    automation
  • Milo
    Milo (w2020)Active • 4 employees • San Francisco, CA, USA
    Milo is the Family AI. We give busy parents back time + mindshare by tackling the daily details with a behind the scenes co-pilot. By pairing a human in the loop with the latest in LLM capabilities we're able to effectively build a copilot for detailed, high context and noisy tasks, via a simple conversational SMS interface.
    artificial-intelligence
    conversational-ai
    ai-assistant
  • adyn
    adyn (s2020)Active • 7 employees • Seattle, WA, USA
    fertility-tech
    machine-learning
    consumer-health-services
  • Nimbus
    Nimbus (w2021)Active • 3 employees • Seattle, WA, USA
    Our mission is to enable FANG-like observability for every organization in the world. We're starting with an optimization engine to reduce datadog costs by an order of magnitude without manual effort from developers.
    artificial-intelligence
    infrastructure
    operations
  • Strac
    Strac (w2022)Active • 6 employees • Bellevue, WA, USA
    Strac DLP (Data Loss Prevention) is an AI Company that eliminates data leaks from SaaS, Cloud, Endpoints and Generative AI apps by automatically detecting and remediating the most sensitive customer data like SSN, DL, Passport, Bank Statements, etc. across all communication channels like Office 365, Gmail, Slack, Onedrive, Google Drive, Zendesk, Salesforce, ChatGPT, Chrome, Jira, Web Applications, Mac, Endpoints, etc.
    generative-ai
    saas
    security
    enterprise
    ai
  • Theneo
    Theneo (w2022)Active • 15 employees • San Francisco, CA, USA
    Next-Gen API Documentation with AI Brilliance. Generate Stripe-like API docs in just a few seconds.
    artificial-intelligence
    developer-tools
    api
    ai